This chapter covers the historical development of the WTO’s mechanism for peer review. It examines the conceptual development of peer review and distils typical core elements (objectives, structure, and participants) by looking at the IMF, the OECD, the FSB, the APRM, the UPR, and the UNFCCC and its Kyoto Protocol. These elements are then applied to analyse the historical advent of the TPRM. The analysis also covers the first five appraisals of the TPRM (1999, 2005, 2008, 2011, and 2013). For each of these, it examines the TPRM’s objectives (including its implementation of the naming and shaming objective and potential link(s) with the Dispute Settlement Body), its structure (focusing on individual reviews and on the yearly overviews of developments in the international trading environment), and on its participants (focusing on governmental attendance and participation rates, the evolving capacities of the WTO secretariat, and on the attitudes of discussants).